Plex with Network Hard Drive

OK, I have been using Plex for a couple of years now, and the only thing that really bothers me about it is that I must pull Plex up on my computer to then be able to stream Plex on one of my Roku players. I currently have a 3TB My Book Live network drive with all of my media on it. Is there any way to just access my media without turning my PC on?

Plex Server has to be running on something. It doesn’t have to be a computer - there are other devices that can run the server.

https://support.plex.tv/hc/en-us/articles/200375666-Plex-Media-Server-Requirements

Thanks!!!